java基本类型作为成员变量时的初始值

package primitivetypedefaultvalue;

public class ListDefaultValue {

public static void main(String[] args) {
PrimitiveType pt=new PrimitiveType();
System.out.println(pt.toString());
}

}
class PrimitiveType{

@Override
public String toString() {
StringBuilder pt=new StringBuilder();
pt.append("age(int):")
.append(this.getAge())
.append("\n")
.append("moneyL：")
.append(this.getMoneyL())
.append("\n")
.append("moneyF:")
.append(this.getMoneyF())
.append("\n")
.append("moneyD:")
.append(this.getMoneyD())
.append("\n")
.append("sex (char):")
.append(this.getSex())
.append("; ")
.append("length(original):")
.append(String.valueOf(this.getSex()).length())
.append("; ")
.append("length(after trim()):")
.append(String.valueOf(this.getSex()).trim().length())
.append("\n")
.append("retire(boolean):")
.append(this.isRetire())
.append("\n")

;
return pt.toString();
}

public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public long getMoneyL() {
return moneyL;
}
public void setMoneyL(long moneyL) {
this.moneyL = moneyL;
}
public float getMoneyF() {
return moneyF;
}
public void setMoneyF(float moneyF) {
this.moneyF = moneyF;
}
public double getMoneyD() {
return moneyD;
}
public void setMoneyD(double moneyD) {
this.moneyD = moneyD;
}
public char getSex() {
return sex;
}
public void setSex(char sex) {
this.sex = sex;
}
public boolean isRetire() {
return retire;
}
public void setRetire(boolean retire) {
this.retire = retire;
}

private int age;
private long moneyL;
private float moneyF;
private double moneyD;
private char sex;
private boolean retire;
}